Attachment for sewing machines for the manufacture of piping



Dec. 15, 1931. AUERBACH 1,836,742

ATTACHMENT FOR SEWING MACHINES FOR THE'MANUFACTURE OF PIPING Filed March 25, 1930 BY Ma A TTORNEY Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE ABRAHAM AUERBAOH, OF BROOKLYN, NEW YORK Application filed March 25, 1530. Serial No. 438,696.

This invention relates to new and useful improvements in an attachment for a sewing machine for the manufacture of blind stitch piping.

The invention has for an object the provision of a device of the class mentioned which is of simple durable construction, de-. pendable in use and eflicient in action, and which can be manufactured and sold at a reasonable cost.

The invention proposes a means for bending a single piece of binding strip so as to have superimposed top and bottom edge folds with the top fold including a lower 15 layer spaced from an upper layer, and an intermediate layer bent from the lower layer and disposed between said lower and upper layers to accomplish said spacing, and with the bottom fold including a top layer, and go both folds so bent that a straight sewing needle may pass thru the lower layer of the top fold and thru the bottom fold to form piping with stitches visible on one side only.

The invention also proposes that said means for bending be adjustable to accommodate binding strips of various thicknesses and widths.

The provision'of means for bending binding strips to form piping with stitches visible on one sde only is generally known, but according to this general knowledge it is necessary that a filler strip be used in conjunction with the binding strip so that the needle during its sewing does notpenetrate the top layer of the top fold. The manufacture of piping therefore, according to known means, is more expensive than according to the instant invention which necessitates the use of a single piece of binding strip only.

A piping with a filler strip is usually made of silk, cut bias, which necessitates a cotton filler cut straight. This filler does not lend the flexibility and shape required for a proper piping. These difficulties are overcome by abandoning the cotton filler which this new device does not use.

When filler strip is used for piping, the color of the former must be the same as that of the binding material, i. e. when white filler strip is used under a sheer red binding material, the piping becomes pink instead of red.

The binding or piping and the filler strip heretofore used had to be cut by special machines on rolls so that the binding and the filler strip would be exactly the same width from start to finish otherwise the attachment would not render proper results.

Inthe present devices the filler strip does not allow piping of curves successfully because of the fact that it is cut straight. Any material cut straight could not pipe or turn on a curve properly. Because of aforementioned reasons the former attachment can only produce a piping of one size.

The bent wire or gauge attached to the pressure foot of my new proposed device overcomes this difiiclfl lty by the provision of an adjustment to produce. a piping of various widths by moving the device toward or away from the said gauge. With this new device various widths of inside piping and double piping can be made.

11 addition, the old piping attachments cannot be used on all sewing machines unless major parts of the machines are changed. This causes inconvenience and difiiculty for a manufacturer or a man not mechanically inclined. Further, the rolls of binding and filler strips are cut by special machines which involvesadditional ex ense. With the present device, piping an binding may be made of the material which is left over from the material used to make the dress.

Further, the known attachments are faulty in operation in that they are not positive when different thicknesses and widths of binding strips are used. This calls for different sized attachments for various widths and thicknesses and necessarily adds expense. In addition to the additional cost, there is annoyance when the proper attachment is not used, since proper results are not then obtained. According to the new attachment a slight adjustment renders the attachment 95 adaptable to binding strips of various thicknesses and widths.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be hadto the following de- 100 scription andaccompanying drawings, and

to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accom anyin drawings forming a material art this d1sclosure:-

Fig. 1 1s a perspective view of an attachment constructed according to this invention shown in use.

Fig. 2 is a plan view of the attachment, per se shown in Fig. 1. I

Fig. 3 is an end elevational'view looking in the direction of the arrows33 of Fig. 2.

Fig.4 is a fragmentary enlarged longitudinal sectional view taken on the line 44 of Fig. 2.

Fig. 5 is a transverse vertical sectional view taken on the line 55 of Fig. 2.

Fig. 6 is a fragmentary transverse sectional view taken on the line 66 of Fig. 2.

Fig. 7 is a bottom view of Fig. 2.

Fig. 8 is a schematic view 0 the binding strip, illustrating the various bends and folds which it assumes and the position of a needle during the stitching operation.

Fig. 9 is a fragmentary vertical sectional view taken on the line 9-9 of Fig. 2.

"Fig. 10 is a similar view to Fig. 9, showing the device set for inside or surface piping.

Fig. 11 is a pers ective view of a piece of material showing ifierent size and type of binding piping and inside or surface piping thereon.

The attachment includes a bottom portion 10 which is wider at the back 11 then at the front 12. The central front section of this I bottom portion is curved upwards as indicated by reference numeral 13 and towards turned downwards as indicated by reference numeral 15. A spring plate 16 is positioned across the front sections of the upwardturned edges 14 and is attached along the rear to the tops of the bent edges 14. The front of the spring plate necessarily is free and is so constructed to press downwards, against the bends of the downwardly directed portions 15. The plate 16 is formed with a longitudinal slot 17 extending nearly from end to end so that a pin or other sharp implement may be engaged thru the slot for initially threading goods thru the attachment.

' A top portion 18 integral with plate 16 is formed between the rear sections of the bent edges 14 and includes a bent section 19. A post 20 is attached upon this top portion 18 and is provided with an aperture slidably sup- .porting a rod 21. A set screw 22 threadedly engages in the post and is abnttable against the rod for holding it in various adjusted positions. One end of the rod 21 passes thru an aperture in the top portion of the bent section 19. The other end of the rod is bent so as to have a portion 23.passing thru an aperture the bent edge 14 opposite the said bent portion 19. Heads 24 are fixed upon the ends of the rod 21 and are adaptedto engage against the edges of a bindin strip 25 engaged thru the attachment. arious adjustments may 'be made to accommodate different widths" of the bindin strip'25. These A bracket 28 is receptive of the stem 27 and is provided with a set screw 29 abuttableagainst the stem for holding the stem and the device to which the stem is secured in various adjusted positions, to correspond with any desired width of piping 50. When the front.12 of attachment 10 is spaced further from guide element 30, the width of the piping sewed on a cloth is increased. If it is desired to sew surface or double inside piping 51 on a cloth, the front 12 of attachment 10 is set to touch guide element 30.

The guide element 30 is attached upon the bracket 28 and projects into the path of motion of binding tape leaving the rear end 12 of the attachment so as to cause this binding tape to bend beneath a foot portion 31 formed on the bracket 28. The top of the bracket 28 is formed with a socket 32 for receiving the lower portion of the presser bar 33 slidable in the sewing machine head 34. The needle 35 of the sewing machine head is adapted to move up and down, immediately to the front of the foot portion 31 of the bracket. This causes the needle to pass thru the binding strip as tached upon one of the bent e ges 14 and is adapted for guiding cloth between the top and bottom edge folds of the binding strip so as to permit the sewing of the piping upon this cloth.

indicated by dot and dash lines, '36 in Flg. 3. A cloth guide late 37 is at- Theoperation of the device may be traced by first examining Figs. 1 and 8 and noting that the binding strip 25 passes thru the attachment and in so passing, engages the bend 19. The edge of the material within said bend necessarily takes the shape thereof. Then, as the material continues through the device, the bend 15 on the ri ht side of Fig. 6 of the drawings causes the a ready bent edge to be bent again. Thus, the first bend becomes the intermediate layer 43, while the second bend becomes the lower layer 41. Thus, as the material emerges from the narrow front end 12 it is in a folded condition. with edge folds 38 and 39 respectively. The

edge fold 39 may be considered as the top edge fold and consists of a top layer 40 and a bottom layer 41. The bottom layer 41 is held in spaced position from the top layer 40 by an intermediate layer 43 formed by bending the outer edge of the bottom layer 41 inwards. The bottom fold 38 consists of a top layer 44 and a bottom layer 45.

The longitudinal center of the binding strip is bulged upwards as shown at 46 due to the upward bulged portion 13'of the attachment. The binding material, when it leaves the front end 12, must be bent downwards and then at right angles so as to extend beneath the foot portion 31 of the bracket 28. This can be clearly visualized by an inspection of Figs. 3 and 8. In Fig. 8 a portion of the binding, indicated by reference numeral 47, is shown bent at right angles to the portion indicated by reference numeral 48. c

It will be noted that the bend 15 on the right side of Fig. 6 is longer than the one on the left side for the reason that the bend in the material made by the bend 19 of the device must again be bent to form the intermediate layer 43, and this can only be done if the bent edge'of the material engages and passes through a re-entrantly bent portion of the device. The re-entrantly bent portion of the device referred to is the longer of the two bends 15.

At the point of bending between the portions 47 and 48, a portion of the binding is positioned in the vertical and the needle 35 is adapted to sew thru the binding at this point. The guide element 30 serves to locate this particular point of the binding. If the set screw 29 is loosened and the bracket 28 slightly moved along the finger 27, this point may be slightly varied so that adjustment can be made for proper sewing, even though binding strips be of different thicknesses of material.

As the needle travels up and down, it passes thru the bottom layer4l of the top fold 39 and the intermediate layer 43 insures against the needle penetrating the top layer 40. Upon further downward motion of the needle it passes thru the fold 38, that is, both layers 44 and 45. In this manner the piping is sewed together so that stitches are visible from one side only.

The binding strip 25 as it passes thru the attachment is bent into the folds 38 and 39 by the upward bent edges 14 and the downward bent portions 15. It will easily be visualized that as the binding strip moves thru the attachment, first one edge is bent by the bent portion 19 to form an upturned edge as shown in Fig. 5. This edge afterwards constitutes the intermediate layer 43 for after the material continues to pass through the device, the edge of the upturned edge is again bent around by bent edge 15 so as to be under the upturned end forming the inedges are bent upwards by the bent edges 14" and 15 of the attachment. This serves to form the binding strip into the shape shown at the right hand portion of Fig. 8. When the binding strip is bent at right angles beneath the foot 31 the upward bulged central portion 46 automatically bends inwards as indicated by reference numeral 47 so that the folds 38 and 39 are superimposed.

If a different tape of a different width be used. the rod 21 may be adjusted for properly adapting the attachment to it. If a binding of a different thickness be used than the one to which the attachment is set, it is merely necessary to move the bracket 28 along the stem 25 so as to obtain the proper bending of the material beneath the foot 31, and this will provide that the needle 35 only passes thru the bottom layer of the top edge fold 39 and thru both layers of the bottom edge fold. This may be explained more clearly as follows: By moving the device closer to the wire 30 which is carried by the presser foot, the wire contacts, and presses against the upper layer 40. This causes the needle to penetrate the lower layer 41 nearer the bend between said layer, and the upper layer 40. Therefore the upper layer will be less puffy and hence narrower. But. as the device is moved away from the wire 30, there is less pressure by the wire against the upper layer 40 so that the needle catches the lower layer 41 nearer the bend between said bend and the intermediate layer 43. Therefore the upper layer 41 will be more puffy and hence wider. Furthermore inasmuch as the wire 30 comes into contact only with the top fold and not the bottom fold at all, it is only the former that is elfected by moving the device nearer to or further away from the wire 30. If it is desired to attach the piping upon the edge of a piece of goods, this goods may be guided upon the guide plate 37 and between the top and bottom folds 38 and 39 respectively. The same stitches which sew the piping together sew it upon the edge of this cloth.

While I have shown and described the preferred embodiment of my invention, it is to be understood that I do not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is 1. A blind stitch piping sewing machine attachment, comprising means for bending a ,strip of binding so as to have top and bottom superimposed edge folds, the top edge fold including a lower layer spaced from an upper layer by an intermediate layer bent from a top layer and a bottom layer, means for bending the folded tape at right angles to the main portion so as to present a small vi- -cinity in whichthe tape is in a vertical position, a stem projecting from the first means, a bracket adjustably receptive of the stem, and a guideelement on the bracket for determiningthe position of the bend in the vicinity of the vertical portion mentioned so as to guide the position of 'the vertical portion.

2. A blind stitch piping sewing machine attachment, comprising means for bending a strip of binding so as to have top and bottom superimposed edge folds, the top edge fold including a lower layer spaced from an upper layer by an intermediate layer bent from the lower layer, and the lower fold including a top layer and a bottom layer, meansfor bending the folded tape at right angles to the main portion so as to present a small vicinity in which the tape is in a vertical position, a stem projecting from the first means, a bracket adjustably receptive of the stem, and a guide element on the bracket for determining the position of'the bend in the vicinity of the vertical portion mentioned so as to guide the position of the vertical porangles to the main tion, said guide element comprising a bent piece of wire arranged in the path of motion of said binding strip.

3. A blind stitch piping sewing machine attachment, comprising means for bending -j' a strip of binding so as to have top and bottom superimposed edge folds, the top edge fold including a lower layer spaced from an upper layer by an intermediate layer bent from the lower layer, and the'lower fold including a to layer and a bottom layer, means for ben 'ng the folded tape at right p'prtion so asto present'a small vicinity in w ch the tape is m a vertical position, a stem projecting from the first means, a bracket adjustably receptive of the stem, a guide element on the bracket for determining the position of the bend in the vicinity of the vertical portion mentioned so as to guide the position of the vertical portion, and means for adjusting the first means to accommodate binding strips of various widths.

4. A, blind stitch piping sewing machine attachment, comprising means for bending a strip of binding so as to have top and bottom superimposed edge folds, the to edge fold including a lower layer spaced man upper layer by an intermediate la er bent from the lower layer, and the lower old including a top bending the folded tape at rig t an 1% to the main ortion so as to present a sma vicinity in which the tape is in a vertical position, a stem projecting from the first means,- -a bracket ad ustably receptive of the stem, a guide layer and a bottom? la er, means for' wide at its rear end an attachment, comprising a bottom portion wide at its rear end and narrow at its front end and formed with upwardly bent edges,

the front sections of'sald edges being bent downwardly, a spring plate attached across said upwardly bent edges and formed with an elongated slot, a top portion connected between the rear sections of the upwardly bent edges andjincluding. a portion for initially bending one edge of a binding strip into a fold, a stem projecting from one of the upwardly bent edges, and a bracket adjustably receptive of said stemand formed with a guide element.

6. A blind stitch piping sewing machine attachment, comprising a bottom portion wide at its rear end and narrow at its front end and formed with upwardly bent edges, the front sections of said edges being bent downwardly, a spring plate attached across said upwardly bent edges and formed with an elongated slot, a top portion'connected between the rear sections of the upwardly bent edges and including a portion for initially bending one edge of a binding strip into a fold, a stem projectin from one of the u wardly bent edges, an a bracket adjustab y receptive of sald stem and formed with a guide element, said spring plate being attached at its rear end only so as to present a springy front end.

7. A blind stitch piping sewing machine attachment comprising a bottom portion wide at its rear end and narrow at its front end and formed with upwardly bent edges, the front sections of said edges being bent downwardly, a spring plate attached across said upwardly bent edges and formed with an elongated slot, a top portion connected between the rear sections of the upwardly bent edges and including a portion for i11 .justably receptive of said stem and formed with a guide element, the central front por tion of said bottom portion being curved u wards and towards the rear gradually sprea ing out so as to be flat. 1

8. A blind stitch iping sewing machine attachment, comprism a bottom portion narrow 'at its front end and formedwitla upwardly bent edges, the front sections of-said edges being bent wide at its" rear end and narrow at its front: end and formed with upwardly bent edges,

downwardly, a spring plate attached across said upwardly bent edges and formed with an elongated slot, atop portion connected between the rear sections of the upwardly bent edges and including a portion for initially bending one edge of a binding strip into a fold, a stem projecting from one of the upwardly bent edges, and a bracket adjustably receptive of said stem and formed with a guide element, a cloth guide plate being attached upon one of the upwardly bent edges for the purpose described. I

.9. A blind stitch piping sewing machine attachment, comprising a bottom portion wide at its rear end and narrow at its front end and formed with upwardly bent edges, the front sections of said edges being bent downwardly, a spring plate attached across said upwardly bent edges and formed with an elongated slot, a top portion connected betweenthe rear sections of the upwardly bent edges and including a portion for initially bending one edge of a binding strip into a fold, a stem projecting from one of the upwardly bent edges, and a bracket adjustably receptive of said stem and formed with a guide element, asupport frame being attached upon the rear sections of said upwardly bent edges for guiding tape upon said bottom portion.

10. A blind stitch piping sewing-machine attachment, comprising a bottom portionwide at its rear end and narrow at its front end and formed with upwardly bent edges, the front sections of said edges being-bent said top portion, a rod slidably mounted in the 0st and having its ends provided with head elements adapted to abut. against the edges of binding material moving across the said bottom portion, a set screw threadedly engaging in said 'post and abutting against said rod to lock said rod in a predetermined, position. i

12. An attachment for forming piping, comprising a main body portion, means carried by said main body portion to fold one edge of a strip of material to present a bottom fold consisting of upper and lower layers, and means carried by said main body portion to fold the other edge of the strip of material to present a top fold consisting of upper and lower layers and an intermediate layer formed integrally with said lower layer.

13. An attachment for forming piping, comprising a main body portion, means car- 'ried by said main body portion to fold one edge of a strip of material to present a bottom fold consisting of upper and lower layers, means carried by said main body portion to foldthe other edgeof the strip of material to present a top fold consisting of upper and lower layers and an intermediate layer formed integrally with said lower layer, and means associated with said main body portion to superimpose said top and bottom folds so that a needle may be passed through the lower layer of the top foldwithout penetrating the upper layer thereof and through the upper and lower layers of the bottom downwardly, a spring plate attached across f d said upwardly bent edges and formed with an elongated slot, a top portion connected between the rear sections of the upwardly bent edges and including a portion for initially bending one edge of a binding strip into a fold, a stem projecting from one of the upwardly bent edges, and a bracket adjustably rece tive-of said stem and formed with a signature.

In testimony whereof I have aflixedmy ABRAHAM AUERBACH.

gm e element, a post being attached upon 7 said top portion, a rod slidably mounted in the (post and having its ends provided with hea elements adapted to abutagainst'the edges of binding material moving across the said bottom portion. I

11. A blind stitch piping sewing machine attachment, comprising a bottom portion the front sections of said edges being bent downwardly, a spring plate attached across said upwardly bent edges and formed with an elongated slot, a top portion connected be- 

